apt policy firefox
firefox:
Installed: 60.2.0esr~linuxmint1+betsy
Candidate: 60.2.0esr~linuxmint1+betsy
Version table:
*** 60.2.0esr~linuxmint1+betsy 700
700 http://mintlinux.mirror.wearetriple.com/packages cindy/upstream amd64 Packages
100 /var/lib/dpkg/status
apt-cache policy firefox
gives the same information.But why is a Betsy version of firefox installed?